When you start out fresh and new, everyone is going to help you because that's how it is in barns. Everyone knows that a new person doesn't know how, so the staff and even the riders will go out of their way to help by tacking, checking your tack, your horse to be sure all is well.
As you get better, you'll be doing your own tacking and you'll be helping. You might get there a little early and find someone needs some help so you'll pitch in too. Your horse's stall might need a little cleaning up, so you'll do that. We ALL pitch in where we can.
I'm the person who empties the water buckets in the tack room the days I'm there (we're the only western class). And I make sure the soap container is covered so the mice don't eat it and the towels are hung up to dry for tomorrow.
Ultimately we're all in it to ride the horses. You're not an outsider although you don't feel like an insider because you don't have your legs and you don't know how to ride or the routines or even what people are talking about or what's what or who's who. Right now you're only there to take lessons.
But eventually the barn becomes YOUR barn and everything in it will lie in that definition, so you'll watch and help and tack up and help someone carry something or turn out someone's horse, etc. That's how you'll learn too, by helping and talking (and bringing cookies). AND treats for the horses. But find out what's acceptable at your barn.